Terahertz Wave Emission from Intrinsic Josephson Junctions in High- TC Superconductors
Recently, we experimentally demonstrated that rectangular mesa structures of intrinsic Josephson junctions (IJJ) in Bi2Sr2CaCu 2O8+d (Bi2212) can be used as a compact solid-state generator of continuous, coherent and polarized terahertz (THz) radiation. In the present work, we will exhibit tall mesas (over 600 junctions) which were fabricated using UV lithography, e-beam lithography with photoresist and e-beam lithography with a Ti selective etching technique. We will present measurements of the c-axis resistance as a function of temperature and of current-voltage characteristics of THz emitting mesas with lateral sizes ranging from 30 x 300 to 100 x 300νm2. Furthermore, we will discuss the dependence of the characteristics of the mesa structures on the oxygen doping level of the Bi2212 crystals. We will also experimentally show that the voltage-frequency relation of the ac Josephson effect has to match the cavity resonance for successful emission.
L. Ozyuzer and Y. Simsek and H. Koseoglu and F. Turkoglu and C. Kurter and U. W. Welp and A. E. Koshelev and K. E. Gray and W. Kwok and T. Yamamoto and K. Kadowaki and Y. I. Koval and H. Wang and P. H. Muller, "Terahertz Wave Emission from Intrinsic Josephson Junctions in High- TC Superconductors," Superconductor Science and Technology, vol. 22, no. 11, IOP Publishing Ltd., Oct 2009.
The definitive version is available at http://dx.doi.org/10.1088/0953-2048/22/11/114009
Geosciences and Geological and Petroleum Engineering
Keywords and Phrases
Ac Josephson effect; Bi-2212; Cavity resonances; e-Beam lithography; High-T; Intrinsic Josephson junction; Lateral sizes; Mesa structure; Oxygen doping; Selective etching; Solid-state generator; Terahertz radiation; Terahertz waves; UV lithography; Electron beam lithography; Josephson junction devices; Current voltage characteristics
International Standard Serial Number (ISSN)
Article - Journal
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